Body coil

Abstract

The embodiments relate to a body coil, to a magnetic resonance device, and to a method for operating a magnetic resonance device. The body coil includes at least one antenna unit and at least one pre-amplification unit, wherein the pre-amplification unit is arranged at a feed point of the antenna unit, wherein the pre-amplification unit has an input reflection factor at the feed point of the antenna unit whose value is greater than 0.7.

Description

[0001]This application claims the benefit of DE 10 2015 213 338.5, filed on Jul. 16, 2015, and DE 10 2016 204 620.9, filed on Mar. 21, 2016, which are hereby incorporated by reference in their entireties.TECHNICAL FIELD[0002]The embodiments relate to a body coil, to a magnetic resonance device, and to a method for operating a magnetic resonance device.BACKGROUND[0003]In the case of the imaging examination of objects, (e.g., patients), by Magnet Resonance Imaging (MRI), a (e.g., permanently installed) body coil, which may also be called a whole body resonator, is currently used for exciting magnetic resonance signals, and this has an antenna unit for this purpose. The magnetic resonance signals may have frequencies around a Larmor frequency. While it is possible to also use the body coil for receiving the magnetic resonance signals, dedicated local coils may be used for this purpose, however. These are conventionally positioned close to the patient and consequently supply a high Sign...

AI Technical Summary

Benefits of technology

The patent describes a way to make a body coil that can be easily detuned and used to capture magnetic resonance signals. One way to do this is to connect the body coil to a specific device when the signals are received. This simplifies the equipment needed for the pre-amplification unit. Another option is to use a simpler design for the antenna unit, which helps reduce the complexity of the overall system. Overall, this patent provides more flexibility and ease of use for magnetic resonance systems.

Problems solved by technology

The high number of coil elements means imaging techniques, in particular parallel imaging techniques, such as, for example, Sensitivity Encoding (SENSE) or Generalized Autocalibrating Partially Parallel Acquisition (GRAPPA) may be applied, which in part lead to significantly reduced scanning times with the same image quality.

Coupling may cause detuning of the local coils, so an adjustment of the coil element to the receive amplifier is affected.

Furthermore, noise from the body coil may also be coupled into the local coil.

Both effects lead to a significant deterioration in a resulting image quality that may manifest itself in a worse signal-to-noise ratio and / or in altered spatial receiving characteristics of the local coil.

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